How to discourage a bear. (Need answer fast!)

[Testy]

How do I discourage a bear from coming around?
I have some free-range chickens that run around the place and yesterday one of them was raising hell about something so I got a .22 and ran outside expecting to see a coyote/cat/some other predator. Instead, I bumped into a black bear. Even allowing for my automatic "holy shit!" reaction, it seemed like a huge damn bear. I set a record for the 30 meter backward dash and got a better rifle. The bear walked away while I was in the house.

Anyway, what will actively discourage a bear? I don't have anything that would encourage him, no trash where he can get at it, nothing to eat at all except the chickens running around. I don't want to shoot the bear but I don't want him wandering around here either.

Any ideas?

Regards

Testy